Using rejection thresholds to determine acceptability of novel bioactive compounds added to milk-based beverages

Abstract

Highlights:  Bioactive casein hydrolysate (NaCaHs) have potential for use in functional foods.  Peptide molecular weight influence the bitterness and bioactivity in NaCaHs.  Rejection threshold models applied to NaCaHs with different bitter profiles.  Consumer rejection thresholds for the NaCaHs is influenced by the food matrix.

Age group determines the acceptability of protein derived off-flavour

“…The statistical methodology chosen to calculate rejection thresholds is important. Murray et al (2019) recently recommended that a complementary approach encompassing both RjT 50 and BET methodologies would be beneficial when estimating the acceptability of sensory properties. We observed that all rejection thresholds calculated by the BET approach were lower than those concentrations calculated using the graphical approach (RjT 50 ) (See Fig.…”

“…5 ). Therefore, in agreement with Murray et al (2019) , BET are a conservative approach to determine acceptability. It may sometimes be more appropriate to use the BET methodology for products where acceptance is particularly important.…”

“…It has recently been recommended that when estimating consumer RjT, both a graphical approach (described above) and a Best Estimate Threshold (BET) approach should be utilised ( Murray et al, 2019 ). Thus, for a complementary comparison between age groups, BET were also calculated by using the adapted method presented by Murray et al (2019) by taking the geometric mean of the first concentration whereby individual participants preferred the blank, and the next lowest concentration where participants preferred the spiked sample. The geometric mean of individual BET within a group gave the age-group BET.…”